5123580
Descrição
Quiz por isabela.merelles, atualizado more than 1 year ago
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Criado por isabela.merelles
aproximadamente 8 anos atrás
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Questão 1
Questão
Which of the major types of membrane proteins are bound to the surface of the membrane?
Responda
-
Integral proteins.
-
Carrier proteins.
-
Peripheral proteins.
-
Channel proteins.
-
Receptor proteins.
Questão 2
Questão
Systems that have energy added to them or energy removed from them are best described as which one of the following:
Responda
-
Open systems.
-
Closed systems.
-
Energy depositing systems.
-
Energy releasing systems.
-
None of the above.
Questão 3
Questão
Which of the following dictate the size and shape of erythrocytes?
Responda
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Interactions with other cells in the vascular system.
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The biological functions / roles of those erythrocytes
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The intracellular content of those erythrocytes.
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The size and shape of the parent (stem) cells from which those erythrocytes arise.
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The size of the vascular system around which those cells must circulate.
Questão 4
Questão
Why does the composition of extracellular fluid differ from that of intracellular fluids?
Responda
-
Because ions are unable to cross the plasma membrane
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Because the plasma membrane is freely permeable to all molecules.
-
Because the plasma membrane is impermeable to water.
-
Because the plasma membrane offers an impermeable barrier to all solutes.
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Because the plasma membrane is selectively permeable to particular solutes.
Questão 5
Questão
Phospholipids can move within the plane of the membrane. Which of the following type of movement rarely occurs?
Responda
-
Lateral Diffusion (Exchanging places with a molecule within the same monolayer).
-
Rotation along their axis.
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Flip-flop (Exchanging places with lipids in the other monolayer of a bilayer).
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Flexion.
-
All the above
Questão 6
Questão
Oxidation and reduction occur simultaneously
Responda
- True
- False
Questão 7
Questão
What are Photoautotrophos?
Responda
-
Organisms that use light energy to synthesise organic molecules from CO2
-
Organisms which use energy from photons of light
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Organisms that useenergy from light energy and organic substrate
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Organisms which use energy derived from chemical bonds
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All the above
Questão 8
Questão
Some enzyme-catalyzed reactions cease completely if their enzyme is absent
Responda
- True
- False
Questão 9
Questão
The rule that oxidation release energy, whereas reductions require energy input, applies to all chemical reactions, not just those that occur in living cells.
Responda
- True
- False
Questão 10
Questão
Some cells adjust their membrane [blank_start]fluidity[blank_end] by modifying the lipid composition of their membranes
Responda
-
fluidity
Questão 11
Questão
The value of ΔH for a reaction is positive, therefore that reaction is catabolic.
Responda
- True
- False
Questão 12
Questão
Which of the following properties causes phospholipid molecules to form self-sealing, membrane bilayers when placed in water?
Responda
-
Phospholipid molecules are hydrocarbons
-
Phospholipid molecules are hydrophylic
-
Phospholipid molecules are hydrophobic
-
Phospholipid molecules are amphipathic
-
Phospholipid molecules are bipolar
Questão 13
Questão
Who pioneered the microscope?
Responda
-
Matthias Scheldien
-
Theodor Schawann
-
Anton van Leeuwenhoek
-
Rudolf Virchopw
-
Robert Hooke
Questão 14
Questão
Which option below is a type of prokaryote morphology?
Responda
-
Cocci (spherical)
-
Bacillus (rods/rod-like)
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Spirochetes (spiral)
-
Vibrio ("commas"/curved rods)
-
All the above
Questão 15
Questão
Which of the following statements is incorrect?
Responda
-
Nuclei and mitochondria are surrounded by a double membrane
-
Hereditary information of a cell is passed on by its proteins
-
Lysosomes and peroxisomes are the site of degradation of unwanted material
-
Bacterial DNA is found in the cystosol
Questão 16
Questão
In the cytoskeleton, microtubules are composed of which of the following subunits?
Responda
-
Motor proteins
-
Alpha tubulin and beta tubulin
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Kinesin
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Dynein
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Oligomers
Questão 17
Questão
Which of the following terms applies to cell-cell communication between adjacent cells and is dependent on physical cell-cell contact?
Responda
-
Autocrine
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Endocrine
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Intracrine
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Juxtacrine
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Paracrine
Questão 18
Questão
What technique below is not used to visualise the cytoskeleton?
Responda
-
Fluorescence microscopy
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Live cell fluorescence microcospy
-
Computer-enhanced digital videaomucroscopy
-
Light microscopy
-
Electron microscopy
Questão 19
Questão
Which of the following membrane proteins penetrate the hydrophobic interior of
the lipid bilayer?
Responda
-
Integral proteins
-
Peripheral proteins
-
Channel proteins
-
Carrier proteins
-
Receptor proteins
Questão 20
Questão
When G < 0, the reaction is exergonic. Which of the following statements is
correct in relation to such reactions?
Responda
-
They can proceed forward and can occur spontaneously
-
They cannot occur spontaneously
-
They measure the thermodynamic spontaneity
-
They need energy to proceed
-
None of the above
Questão 21
Questão
Which one of the following statements is correct in relation to enzyme inhibition?
Responda
-
Enzyme inhibition is always irreversible
-
Reversible inhibition can be competitive and non-competitive
-
Enzyme inhibitors cannot be used as therapeutic agents
-
In non- competitive inhibition, the inhibitor competes with the substrate for the same binding site on the enzyme
-
None of the above
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